52800721 has 4 divisors (see below), whose sum is σ = 52819252. Its totient is φ = 52782192.

The previous prime is 52800703. The next prime is 52800731. The reversal of 52800721 is 12700825.

52800721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45751696 + 7049025 = 6764^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 52800721 - 2⁷ = 52800593 is a prime.

It is a super-2 number, since 2×52800721² = 5575832276239682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52800701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3990 + ... + 11023.

It is an arithmetic number, because the mean of its divisors is an integer number (13204813).

Almost surely, 2^52800721 is an apocalyptic number.

It is an amenable number.

52800721 is a deficient number, since it is larger than the sum of its proper divisors (18531).

52800721 is a wasteful number, since it uses less digits than its factorization.

52800721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18530.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 52800721 is about 7266.4104618443. The cubic root of 52800721 is about 375.1571986862.

The spelling of 52800721 in words is "fifty-two million, eight hundred thousand, seven hundred twenty-one".